List of applications I recommend for the typical user. I personally prefer the default desktop interface KDE, but if you have a system that is less capable, check out LXQt Desktop Environment and see if it works better for your purposes. Once you are set
I use it for Google applications and Netflix, so specific multimedia apps that have DRM. Outside of that, I find Chrome to be several steps behind Firefox in terms of speed and use of memory. I still use this often but for machines that have lower powered specifications, Chrome is not your friend.
I wouldn’t attempt to rewrite the Java install instructions on the openSUSE Wiki, especially since I have contributed many edits to it. If you find that you are having issues with the open source version of Java, I recommend you install the genuine article of Java from Oracle. I recommend you just install the Java Runtime Environment and use Oracle’s RPM for install. The process takes some work but when you have it working, it works pretty well.
The great thing about open source projects is that there are so many options. The downside, there are so many options and it can be overwhelming. Rather than give you ALL the options, I will give you my “go to” applications that I regularly count on. In no way am I saying that these are the best applications, there may be better options out there but these work well for me and is a starting point. Should my choice of application be lacking in some sort of feature, it is likely there is something similar that would work better for you.